I can honestly feel for them a bit. There are colleagues they've worked along side for decades, who were ideologically different but fundamentally rational up to what strikes them as extremely recently.
The problem ultimately is because they were working alongside these people for decades, the little eccentricities of the party went unnoticed or dismissed. "Just politics", ignoring the fundamental rot in the party's foundation that's been festering for half a century at this point. They got gaslit by their own colleagues, believing they were rational and sane. Now that the mask is deliberately being pulled off, they're blindsided.
Nancy Pelosi is the character in a Zombie movie who is pleading through tears as a former loved one shambles towards them, desperate to hold to the belief that they would never hurt her.